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Equity Method Investments - Limited Partnerships 1 (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2019
CNY (¥)
item
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Schedule of Equity Method Investments [Line Items]          
Number Of Additional Investments Accounted For Equity Method Investment | item 2 2      
Proceeds from disposal of an equity method investment $ 646 ¥ 4,500 ¥ 3,400    
Payments to Acquire Equity Method Investments $ 83,239 579,492 404,204 ¥ 63,000  
Impairment of equity method investment   ¥ 0 0    
Shanghai Qinlin Information Technology Co., Ltd          
Schedule of Equity Method Investments [Line Items]          
Effective interests in the limited partnerships       30.00%  
Equity Method Investment, Amount Sold     17,000    
Proceeds from disposal of an equity method investment     3,400    
Equity Method Investment, Realized Gain (Loss) on Disposal, Total     ¥ 493    
Shanghai Gefei Fangdd Asset Management Ltd          
Schedule of Equity Method Investments [Line Items]          
Effective interests in the limited partnerships 40.00% 40.00% 40.00%   40.00%
Payments to Acquire Equity Method Investments         ¥ 4,000